CA2058070A1 - Electronic electricity meter - Google Patents
Electronic electricity meterInfo
- Publication number
- CA2058070A1 CA2058070A1 CA002058070A CA2058070A CA2058070A1 CA 2058070 A1 CA2058070 A1 CA 2058070A1 CA 002058070 A CA002058070 A CA 002058070A CA 2058070 A CA2058070 A CA 2058070A CA 2058070 A1 CA2058070 A1 CA 2058070A1
- Authority
- CA
- Canada
- Prior art keywords
- module
- electricity meter
- terised
- charac
- modules
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Power Engineering (AREA)
- Engineering & Computer Science (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
- Elimination Of Static Electricity (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Organic Insulating Materials (AREA)
- Dental Preparations (AREA)
- Polymerisation Methods In General (AREA)
- Connections Arranged To Contact A Plurality Of Conductors (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Disintegrating Or Milling (AREA)
- Electron Sources, Ion Sources (AREA)
- Thermistors And Varistors (AREA)
- Coupling Device And Connection With Printed Circuit (AREA)
Abstract
Abstract The measuring circuit, having two connecting terminals (1) for one phase of the load current and a current sensor connected thereto, is designed in the form of a flat module (M). The two connecting terminals (1) are arranged one above the other on one of the end faces of the module.
This leads to a significant reduction in the meter width and to a reduction in the production costs, since these modules are also used for multi-phase meters, in a correspondingly increased quantity.
(Fig- 2)
This leads to a significant reduction in the meter width and to a reduction in the production costs, since these modules are also used for multi-phase meters, in a correspondingly increased quantity.
(Fig- 2)
Description
2a~7~
Z ELLWEGER USTER AG, CH- a 610 Uster YA-1/198 Electronlc Electricity ~eter The present invention relates to an electronlc electricity meter with a measuring circui~ having two connecting terminals for one phase of the load current and a current sensor connected t:hereto.
The increasing miniaturisation of electronics appears to have passed present-day electricity meters by without trace, even when these are so-called solid-state, that is to say electronic, meters. This is because at least the width of the meter housing, which is determined essentially by the connecting terminals arranged side-by-side, is becoming hardly any smaller. The production costs are also becoming hardly more favourable and there are also no synergetic effects to be found between single-phase and multi-phase meters.
As a result of the invention, it is now intended to achieve, on the one hand, a simplification and reduc-tion in the cost of meter production and, on the other hand, a detectable reduction in the meter dimensions.
This object is achieved by the measuring circuit being designed in the form of a flat module and by the two connecting terminals being arranged one above the other on one of the end faces of the module.
With the same terminal cross-section, the solu-tion according to the invention leads to halving of the meter width and, on the other hand, permits the .lse of a terminal cross-section matched to the current intensity.
The design as a module leads to a reduction in the production costs, since in practice only single-phase modules have to be produced, in triple quantities for this purpose. If neutral conductor modules are also designed in the same form as the modules forming the measuring circuits, a uniform appearance of the different module$ and a continuous modular structure of the elec-tricity meters are produced.
The invention is explained in more detail in the following te~t on the basis of an exemplary embodiment and the drawings, in which:
' .
Z ELLWEGER USTER AG, CH- a 610 Uster YA-1/198 Electronlc Electricity ~eter The present invention relates to an electronlc electricity meter with a measuring circui~ having two connecting terminals for one phase of the load current and a current sensor connected t:hereto.
The increasing miniaturisation of electronics appears to have passed present-day electricity meters by without trace, even when these are so-called solid-state, that is to say electronic, meters. This is because at least the width of the meter housing, which is determined essentially by the connecting terminals arranged side-by-side, is becoming hardly any smaller. The production costs are also becoming hardly more favourable and there are also no synergetic effects to be found between single-phase and multi-phase meters.
As a result of the invention, it is now intended to achieve, on the one hand, a simplification and reduc-tion in the cost of meter production and, on the other hand, a detectable reduction in the meter dimensions.
This object is achieved by the measuring circuit being designed in the form of a flat module and by the two connecting terminals being arranged one above the other on one of the end faces of the module.
With the same terminal cross-section, the solu-tion according to the invention leads to halving of the meter width and, on the other hand, permits the .lse of a terminal cross-section matched to the current intensity.
The design as a module leads to a reduction in the production costs, since in practice only single-phase modules have to be produced, in triple quantities for this purpose. If neutral conductor modules are also designed in the same form as the modules forming the measuring circuits, a uniform appearance of the different module$ and a continuous modular structure of the elec-tricity meters are produced.
The invention is explained in more detail in the following te~t on the basis of an exemplary embodiment and the drawings, in which:
' .
- 2 - 2~8~70 Fig. 1 shows a front view of a measuring cell of an electricity meter, Fig. 2 shows a view in the direction o-f the arrow II in Fig. 1, Fig. 3 shows a plan view onto the measuring cell in Fig. 1, Fig. 4 shows a schematic representation of a meter housing and of the modules arranged therein; and Fig. 5 shows an exploded repxesentation of a meter housing, using modules to clarify the modular e~uipment concept.
~ igures 1 to 3 show a measuring cell M of an electricity meter in three views, to a scale of 1.5 : 1.
According to the representation, this measuring cell has the form of a flat box with the approximate dLmensions 90x60x16 millimetres and it contains a measuring circuit for one phase of the current to be measured. If this current is a three~phase alternating current, then the relevant electricity meter contains three such measuring cells ~ and a neutral conductor module of the same form, as a result of which a continuously modular structure and a uniform appearance of the electricity meter are achieved. Ribs and slots provided on the outer wall of the measuring cell ~ are used for centring the individual modules in the meter housing and with respect to one another; rivets for attaching the housing cover are design~ted with the reference symbol B.
Each measuring cell M contains, in particular, two connecting terminals 1 of a current path which, according to the representation, are not arranged side-by-side, as was usual in the past, but one above the other, as a result of which a noticeable reduction in the housing width is produced for a three-phase meter. The two connecting terminals l do not, of course, necessarily have to be aligned with one another; they can also be slightly offset with respect to one another. The essen-tial feature is that they are located one above the other and not side-by-side. In this case, the mutual separation can be minimal, since the two connecting terminals of the ~ 3 - 2~
current path of one phase actually exhibit the same voltage and the minimum distance required to achieve the surge-withstanding capability specified between two phases is thus not necessary. In the case of the arrange-ment one above the other, the cross-section of the connecting terminals can be selected to be significantly larger than in the past and it can thus be matched to the respective current intensities within wide limits.
As can be seen, in particular, from Fig. 2, as well as the connecting terminals 1, the measuring cell M
also has a connecting socket 2 for a pin or bolt 3, in the manner of a banana connector, which is used for calibration of the meter and whose operation is described in the CH Patent Application No. 00 037/91-4 of 09.01.1991.
Fig. 4a shows a schematic representation of the lower part G of a meter housing and the modules arranged in the housing, which are represented individually in Figs. 4b and 4c. According to the representation, the housing lower part G contains two mounting rails 6 with slots and ribs for engagement of the corresponding opposing pieces of the individual modules. In this way, the mounting of the modules in the housing can take place simply by plugging ~he module stac~ into the mounting rails 6. The module stack is fixed by screwing the cover (not represented) to holes 7 in the mounting rails 6.
The meter according to Fig. 4a contains three measuring modules ~measuring cells~ M of the type repres-ented in Figs. 1 to 3 and a neutral module N; these are the so-called base modules, which are represented separ-ately once again in Fig. 4b. The remaining space adjacent to the neutral module N is provided for so-called option modules for additional functions (Fig. 4b). All these option modules have a fixing rib 8 on their one side surface and a fixing slot 9 on their other side surface;
the neutral module N is likewise provided with a fixing slot 9 on its side surface adjacent to the option mod-ules, 50 that all these modules can easily be pushed into one another and flxed.
2 3) ~
4 ~
The following option modules can be present:
- Switching relay RE triggered by a ripple-control receiver;
- Tariff modules TM for external tariff or period control;
- Pulse transfer contacts IM for the transfer of the measuring pulses for other purposes, for example for displays or the like, and/or of control pulses for a maximum-meter. These control pulses can, for example, be those for the measuring periods or for resetting the maximum meter.
- Interfaces SM for remote reading of the meter, ir-respective of whether this is deliberate, active remote reading at a location remote from the meter, for example by pushing a card into an output equip-ment, or by signalling the meter state back via the network to a central control.
- Customer-specific modules KM for the connection of external meter pulses from other meters (e.g. gas, water);
- Blanking parts BM for filling any free space resulting between the mounting rails.
All the option modules have a base part SO on which the fixing rib 8 and the fixing slot 9 are designed, as well as the necessary contacts. The blanking parts BM
consist only of a base, in the case of the switching relays RE a flat housing 10 is attached to the base, in which housing the actual relay is arranged~ In the case of the other option modules, that is, in the case of the tariff modules TM, in the case of the pulse transfer contacts IM, in the case of the interfacas SM for remote meter reading and in the case of the customer-specific modules KM, the base SO supports a printed-circuit board L. In addition, the widths of all the modules, that is to say the base and the option modules, are matched to one another. For example, all the base modules M and N
have a width of 16.5 and all the option modules (with the exception of the blanking parts BM) have a width of 11 millimeters. The width of the blanking parts B~ is ` _ 5 _ 2~
5 mm and the distance between the mounting rails 6 is an integer multiple of the base module width. It can easily be seen that the space between the mounting rails can always be completely filled with this stepping of the widths.
Fig. 5 shows the modular equipment concept on the basis of an exploded representation of the individual parts of an electricity meter. As in Fig. 4a, the housing lower part is designaled with the reference symbol G; AT3 designates a three-phase connecting part with an inte-grated transducer, which conta:ins three measuring mod-ules M and a neutral module N, :Ln an analogous manner to Fig. 4a; the reference symbol AT1 designates a single-phase connecting part with two measuring circuits, which can be inserted in t~e housing lower part G as an altern-ative to the three-phase connecting part AT3; and the reference symbol OP designates three option modules, a switching relay RE underneath them on the extreme left.
When the required connecting parts and option modules are attached in the housing lower part G, some more board-like modules are placed thereon, namely a measuring board MP with an interface to the option modul~s, a tari~f module T~ with a suitable display area ~LCD) and an electrooptical interface, and a power ~5 supply board NP, the la-tter only in the case of three-pha~e meters, however. Finally, the housing cover GD and the terminal cover gD are attached, both of which can be lead sealed.
The described design of the measuring circuit as a module with connecting terminals arranged one above the other reduces tha meter dimensions quite considerably and leads to a noticeable reduction in the production costs, in that only one model of a module still has to be produced for the measuring circuits, this being produced, in addition, in a correspondingly increased quantity.
The described concept means that the final configuration to be delivered to the customer does not need to be defined until very late in the production sequence ancl that meters which have already been 6 2~8~7~
.
delivered and installed can be extended or modified by insertion or replacement of modules. The latter is not only an advantage for the producer but also for the customer.
~ igures 1 to 3 show a measuring cell M of an electricity meter in three views, to a scale of 1.5 : 1.
According to the representation, this measuring cell has the form of a flat box with the approximate dLmensions 90x60x16 millimetres and it contains a measuring circuit for one phase of the current to be measured. If this current is a three~phase alternating current, then the relevant electricity meter contains three such measuring cells ~ and a neutral conductor module of the same form, as a result of which a continuously modular structure and a uniform appearance of the electricity meter are achieved. Ribs and slots provided on the outer wall of the measuring cell ~ are used for centring the individual modules in the meter housing and with respect to one another; rivets for attaching the housing cover are design~ted with the reference symbol B.
Each measuring cell M contains, in particular, two connecting terminals 1 of a current path which, according to the representation, are not arranged side-by-side, as was usual in the past, but one above the other, as a result of which a noticeable reduction in the housing width is produced for a three-phase meter. The two connecting terminals l do not, of course, necessarily have to be aligned with one another; they can also be slightly offset with respect to one another. The essen-tial feature is that they are located one above the other and not side-by-side. In this case, the mutual separation can be minimal, since the two connecting terminals of the ~ 3 - 2~
current path of one phase actually exhibit the same voltage and the minimum distance required to achieve the surge-withstanding capability specified between two phases is thus not necessary. In the case of the arrange-ment one above the other, the cross-section of the connecting terminals can be selected to be significantly larger than in the past and it can thus be matched to the respective current intensities within wide limits.
As can be seen, in particular, from Fig. 2, as well as the connecting terminals 1, the measuring cell M
also has a connecting socket 2 for a pin or bolt 3, in the manner of a banana connector, which is used for calibration of the meter and whose operation is described in the CH Patent Application No. 00 037/91-4 of 09.01.1991.
Fig. 4a shows a schematic representation of the lower part G of a meter housing and the modules arranged in the housing, which are represented individually in Figs. 4b and 4c. According to the representation, the housing lower part G contains two mounting rails 6 with slots and ribs for engagement of the corresponding opposing pieces of the individual modules. In this way, the mounting of the modules in the housing can take place simply by plugging ~he module stac~ into the mounting rails 6. The module stack is fixed by screwing the cover (not represented) to holes 7 in the mounting rails 6.
The meter according to Fig. 4a contains three measuring modules ~measuring cells~ M of the type repres-ented in Figs. 1 to 3 and a neutral module N; these are the so-called base modules, which are represented separ-ately once again in Fig. 4b. The remaining space adjacent to the neutral module N is provided for so-called option modules for additional functions (Fig. 4b). All these option modules have a fixing rib 8 on their one side surface and a fixing slot 9 on their other side surface;
the neutral module N is likewise provided with a fixing slot 9 on its side surface adjacent to the option mod-ules, 50 that all these modules can easily be pushed into one another and flxed.
2 3) ~
4 ~
The following option modules can be present:
- Switching relay RE triggered by a ripple-control receiver;
- Tariff modules TM for external tariff or period control;
- Pulse transfer contacts IM for the transfer of the measuring pulses for other purposes, for example for displays or the like, and/or of control pulses for a maximum-meter. These control pulses can, for example, be those for the measuring periods or for resetting the maximum meter.
- Interfaces SM for remote reading of the meter, ir-respective of whether this is deliberate, active remote reading at a location remote from the meter, for example by pushing a card into an output equip-ment, or by signalling the meter state back via the network to a central control.
- Customer-specific modules KM for the connection of external meter pulses from other meters (e.g. gas, water);
- Blanking parts BM for filling any free space resulting between the mounting rails.
All the option modules have a base part SO on which the fixing rib 8 and the fixing slot 9 are designed, as well as the necessary contacts. The blanking parts BM
consist only of a base, in the case of the switching relays RE a flat housing 10 is attached to the base, in which housing the actual relay is arranged~ In the case of the other option modules, that is, in the case of the tariff modules TM, in the case of the pulse transfer contacts IM, in the case of the interfacas SM for remote meter reading and in the case of the customer-specific modules KM, the base SO supports a printed-circuit board L. In addition, the widths of all the modules, that is to say the base and the option modules, are matched to one another. For example, all the base modules M and N
have a width of 16.5 and all the option modules (with the exception of the blanking parts BM) have a width of 11 millimeters. The width of the blanking parts B~ is ` _ 5 _ 2~
5 mm and the distance between the mounting rails 6 is an integer multiple of the base module width. It can easily be seen that the space between the mounting rails can always be completely filled with this stepping of the widths.
Fig. 5 shows the modular equipment concept on the basis of an exploded representation of the individual parts of an electricity meter. As in Fig. 4a, the housing lower part is designaled with the reference symbol G; AT3 designates a three-phase connecting part with an inte-grated transducer, which conta:ins three measuring mod-ules M and a neutral module N, :Ln an analogous manner to Fig. 4a; the reference symbol AT1 designates a single-phase connecting part with two measuring circuits, which can be inserted in t~e housing lower part G as an altern-ative to the three-phase connecting part AT3; and the reference symbol OP designates three option modules, a switching relay RE underneath them on the extreme left.
When the required connecting parts and option modules are attached in the housing lower part G, some more board-like modules are placed thereon, namely a measuring board MP with an interface to the option modul~s, a tari~f module T~ with a suitable display area ~LCD) and an electrooptical interface, and a power ~5 supply board NP, the la-tter only in the case of three-pha~e meters, however. Finally, the housing cover GD and the terminal cover gD are attached, both of which can be lead sealed.
The described design of the measuring circuit as a module with connecting terminals arranged one above the other reduces tha meter dimensions quite considerably and leads to a noticeable reduction in the production costs, in that only one model of a module still has to be produced for the measuring circuits, this being produced, in addition, in a correspondingly increased quantity.
The described concept means that the final configuration to be delivered to the customer does not need to be defined until very late in the production sequence ancl that meters which have already been 6 2~8~7~
.
delivered and installed can be extended or modified by insertion or replacement of modules. The latter is not only an advantage for the producer but also for the customer.
Claims (15)
1. Electronic electricity meter with a measuring circuit having two connecting terminals for one phase of the load current and a current sensor connected thereto, characterised in that the measuring circuit is designed in the form of a flat module (M), and in that the two connecting terminals (1) are arranged one above the other on one of the end faces of the module.
2. Electricity meter according to Claim 1, charac-terised in that the two connecting terminals (1) are located vertically one above the other and are offset in depth with respect to one another.
3. Electricity meter according to Claim 2, charac-terised in that the module (M) has a box-like shape and is provided on its outer surfaces with ribs and slots, which are provided for engagement with corresponding slots and ribs of other modules or of a meter housing.
4. Electricity meter according to Claim 3, charac-terised by a neutral module (N) designed in the manner of a measuring cell or measuring cells (M), likewise as a module.
5. Electricity meter according to Claim 4, charac-terised in that, in addition to the said modules (M,N), referred to in the following text as base modules, so-called option modules (OP) are also provided for addi-tional functions.
6. Electricity meter according to Claim 5, charac-terised in that the option modules (OP) are designed similarly to the base modules (M,N) and have a fixing rib (8) on their one end surface and a fixing slot (9) on their other end surface.
7. Electricity meter according to Claim 6, charac-terised in that the base modules (M,N) and the option modules (OP) can be plugged together to form a module stack and in that means of retention (6) are provided in the meter housing (G) for holding the module stack.
8. Electricity meter according to Claim 7, charac-terised in that the means of retention (6) are formed by mounting rails, into which the module stack can be pushed.
9. Electricity meter according to Claim 6, charac-terised in that the option modules consist of a base part (SO) and of a printed-circuit board (L) supported thereby.
10. Electricity meter according to one of Claims 7 to 9, characterised by blanking parts (BM), of similar design to the option modules (OP), for matching the width of the module stack to the distance between the means of retention.
11. Electricity meter according to Claim 6, charac-terised by a switching relay (RE), forming an option module (OP) and triggered by a ripple-control receiver.
12. Electricity meter according to Claim 6, charac-terised by a so-called tariff module (IM), forming an option module (OP), for external tariff or period control.
13. Electricity meter according to Claim 6, charac-terised by pulse transferring contacts (IM), forming an option module (OP), for transferring measuring pulses and/or control pulses.
14. Electricity meter according to Claim 6, charac-terised by an interface (SM), forming an option mod-ule (OP), for remote reading of the meter.
15. Electricity meter according to Claim 6, charac-terised by a customer-specific module (KM), forming an option module (OP), for the connection of external meter pulses.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH36/91A CH681749A5 (en) | 1991-01-09 | 1991-01-09 | |
| CHS.N.00036/91-2 | 1991-01-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2058070A1 true CA2058070A1 (en) | 1992-07-10 |
Family
ID=4177880
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002058070A Abandoned CA2058070A1 (en) | 1991-01-09 | 1991-12-19 | Electronic electricity meter |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US5317250A (en) |
| EP (1) | EP0494428B1 (en) |
| AT (1) | ATE136369T1 (en) |
| AU (1) | AU651404B2 (en) |
| CA (1) | CA2058070A1 (en) |
| CH (1) | CH681749A5 (en) |
| DE (1) | DE59107652D1 (en) |
| FI (1) | FI920008A (en) |
| NO (1) | NO920110L (en) |
| NZ (1) | NZ241241A (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0942290A1 (en) * | 1998-03-13 | 1999-09-15 | Electrowatt Technology Innovation AG | Apparatus with non-customized components, at least one customized component, and at least one processor |
| US6483289B2 (en) * | 1998-03-18 | 2002-11-19 | Square D Company | Modular sensor array, metering device and mounting and connection base |
| US6713997B2 (en) | 2001-02-09 | 2004-03-30 | Square D Company | Power metering module |
| US20070067119A1 (en) * | 2005-09-16 | 2007-03-22 | Power Measurement Ltd. | Rack-mounted power meter having removable metering options module |
| US20110096470A1 (en) * | 2006-06-01 | 2011-04-28 | Joseph Scott Dixon | Systems, devices, and methods for distributing electrical energy |
| JP5222542B2 (en) * | 2007-12-07 | 2013-06-26 | 矢崎総業株式会社 | Current sensor |
| WO2009133216A1 (en) * | 2008-04-30 | 2009-11-05 | Indra Sistemas, S.A. | Multiuser electricity exchange measuring apparatus |
| DE102008063878A1 (en) * | 2008-12-19 | 2010-07-01 | Hager Electro Gmbh & Co. Kg | An accessory for an electricity meter connection installation, in particular for communication with the electricity meter |
| DE102009008125B4 (en) | 2009-02-09 | 2020-01-23 | IAD Gesellschaft für Informatik, Automatisierung und Datenverarbeitung mbH | Modular, expandable measuring device with an access-protected area |
| US11456569B2 (en) | 2017-12-14 | 2022-09-27 | Veris Industries, Llc | Electrical fault detection for a modular busway |
| US11360130B2 (en) | 2019-06-20 | 2022-06-14 | Schneider Electric USA, Inc. | Distributed electrical energy meter |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2908866A (en) * | 1959-10-13 | Measuring apparatus | ||
| US1737303A (en) * | 1927-07-15 | 1929-11-26 | Ac Spark Plug Co | Ammeter-magnetic pointer type |
| US2705902A (en) * | 1953-08-26 | 1955-04-12 | Gen Electric | Light-beam projection indicating instrument |
| US2871450A (en) * | 1956-10-09 | 1959-01-27 | Internat Instr Inc | Electrical measuring instruments |
| US3333191A (en) * | 1963-05-06 | 1967-07-25 | Triplett Electrical Instr Co | Electrical instrument having light projected digital readout and movement operated control elements |
| US3401337A (en) * | 1964-04-09 | 1968-09-10 | Union Carbide Corp | Connector device for connecting a battery terminal with a batterylife indicator meter |
| DE2257972A1 (en) * | 1972-11-27 | 1974-06-06 | Georg Stoehr | UNIVERSAL COUNTER DISTRIBUTION, FULLY INSULATED AND COMBINABLE |
| US4041358A (en) * | 1975-07-23 | 1977-08-09 | Sola Basic Industries, Inc. | Meter module assembly for a meter panel |
| AT389173B (en) * | 1983-03-31 | 1989-10-25 | Uher Ag | PERFORMANCE CARD DISPLAY DEVICE |
| EP0262293B1 (en) * | 1986-09-29 | 1990-12-27 | Landis & Gyr Betriebs AG | Measuring transformer for the measurement of a current flowing in an electric conductor |
| US5001420A (en) * | 1989-09-25 | 1991-03-19 | General Electric Company | Modular construction for electronic energy meter |
| CH681492A5 (en) * | 1991-01-09 | 1993-03-31 | Zellweger Uster Ag |
-
1991
- 1991-01-09 CH CH36/91A patent/CH681749A5/de not_active IP Right Cessation
- 1991-12-17 AU AU89815/91A patent/AU651404B2/en not_active Ceased
- 1991-12-19 CA CA002058070A patent/CA2058070A1/en not_active Abandoned
- 1991-12-20 DE DE59107652T patent/DE59107652D1/en not_active Expired - Fee Related
- 1991-12-20 AT AT91121910T patent/ATE136369T1/en not_active IP Right Cessation
- 1991-12-20 EP EP91121910A patent/EP0494428B1/en not_active Expired - Lifetime
-
1992
- 1992-01-02 FI FI920008A patent/FI920008A/en not_active Application Discontinuation
- 1992-01-07 NZ NZ241241A patent/NZ241241A/en unknown
- 1992-01-08 NO NO92920110A patent/NO920110L/en unknown
- 1992-01-09 US US07/818,676 patent/US5317250A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| ATE136369T1 (en) | 1996-04-15 |
| US5317250A (en) | 1994-05-31 |
| FI920008A0 (en) | 1992-01-02 |
| NO920110D0 (en) | 1992-01-08 |
| CH681749A5 (en) | 1993-05-14 |
| NO920110L (en) | 1992-07-10 |
| AU8981591A (en) | 1992-07-16 |
| EP0494428B1 (en) | 1996-04-03 |
| DE59107652D1 (en) | 1996-05-09 |
| FI920008A (en) | 1992-07-10 |
| NZ241241A (en) | 1995-04-27 |
| EP0494428A2 (en) | 1992-07-15 |
| AU651404B2 (en) | 1994-07-21 |
| EP0494428A3 (en) | 1994-06-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |